角向偏振光束大数值孔径透镜聚焦的偏振开关现象  

Polarization Switches Phenomena of Tight Focusing of an Azimuthally Polarized Beam Through a High Numerical Aperture Lens

作　　者：田博[1] 蒲继雄[1] 

机构地区：[1]华侨大学信息科学与工程学院,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2012年第3期247-250,共4页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(60977068)

摘　　要：利用Richards-Wolf矢量衍射积分模型,推导双环角向偏振光束经过环状高数值孔径透镜聚焦后聚焦区域的偏振特性,并用数值计算分析各相关参数的取值变化对焦面光斑的偏振分布的影响.研究表明:双环角向偏振光束经过环状高数值孔径透镜聚焦以后,其光斑内环的偏振方向发生改变;通过控制各相关参数的取值,可以控制聚焦光斑的偏振分布,形成一种可控的偏振开关.By using the Richards-Wolf vector diffraction theory,the polarization properties in focused area of a double-ring-shaped azimuthally polarized beam through an annular high numerical aperture lens are studied in this paper.Numerical calculations are performed to compare the influence of corresponding parameters on the tight polarization properties.It is shown that tight focusing of a double-ring-shaped azimuthally polarized beam can change the polarization direction of the inner ring in the focal field.The correlated parameters changed,the polarization direction shows gradual change and controllable polarization switch occurred.

关 键 词：双环角向 偏振光束 高数值孔径 偏振开关 Richards-Wolf衍射积分 

分 类 号：O436[机械工程—光学工程]